Parallel Interface (Reverse Channel); Table 1-33 Pin Assignments For Reverse Channel - Epson FX-2170 Service Manual

FX-2170 Service Manual

1.3.2.2 Parallel Interface (Reverse Channel)

Transmission mode
Adaptable connector
Synchronization
Handshaking
Signal level
Data transmission timing

Table 1-33 Pin Assignments for Reverse Channel

Pin
Signal
No, Name
1
HostClk
2
DATA1
3
DATA2
4
DATA3
5
DATA4
6
DATA5
7
DATA6
8
DATA7
9
DATA8
10
PtrClk
PtrBusy /
11
DataBit-3, 7
AckDataReq/
12
DataBit-2, 6
Xflag /
13
DataBit-1, 5
14
HostBusy
31
INIT
DataAvail /
32
DataBit-0, 4
36
1284-Active
18
Logic H
35
+5 V
17
Chassis
16, 33,
GND
19-30
15, 34
NC
Rev.A
IEEE-P1284 nibble mode
57-30360 (Amphenol) or equivalent
Refer to the IEEE-P1284 Specification
Refer to the IEEE-P1284 Specification
TTL-compatible (IEEE-P1284 level 1 device)
Refer to the specification
Return GND
In /Out
Pin
19 In
20 In
21 In
22 In
23 In
24 In
25 In
26 In
27 In
28 Out
29 Out
28 Out
28 Out
30 In
30 In
29 Out
30 In
—— Out
—— Out
—— ——
—— ——
—— ——
Function Description
Host clock signal.
Parallel input data to the printer
Printer clock signal.
Printer busy signal and reverse channel transfer of data
bits 3 or 7
Acknowledge data request signal and reverse channel
transfer of data bits 2 or 6
X-flag signal and reverse channel transfer of data bits 1
Host busy signal.
Not used.
Data available signal and reverse channel transfer of
data bits 0 or 4
1284 active signal.
This line is pulled up to + 5 V through 3.3K
This line is pulled up to +5 V through 3.3K
Chassis GND.
Signal GND.
Not connected.
Product Description
bit 0: LSB
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7: MSB
or 5
resistor.
resistor.
1-23